cheers for this, I didn't use it for myBuny, but I did mod it to be an XBOX 360 tag with image instead
For anyone that wants it, here's the code, obviously same rules with the field number...
Code:
<if condition="$post['field5']"><div><a href="http://live.xbox.com/member/$post[field5]" target="_blank"><img src="images/misc/xbox360.gif" border="0" alt="View my XBOX 360 Profile"></a></div></if>